I'd say it's a fair guess that the reason no-one chose to answer you before is because you stated (or appeared to state) that you use your computer to download pornography.
You have however made every correct effort to get an answer, giving those who might answer all the information they should require. Good work on that front.
These files are notorious for carrying malware (viruses, trojan horse files etc) and you have been extremely lucky if you have not been infected by one of the many files that are distributed by this method. I'm not going to pass judgement one way or the other but I would just say you would have a better chance of getting help if you left that part out of your post. I'm afraid I can't think of a reason why you are having the problems you seem to be having. Good Luck!